#!/usr/bin/env python3
"""
dumprec.py - extract one record from a *.mw4, decoded.

    python3 dumprec.py <pkg.mw4> "<entry name>" [outfile]

The entry name is matched case-insensitively with backslashes normalised to
'/', e.g.  "mechs/atlas/atlas.subsystems".  With no outfile the bytes go to
stdout. Pass "--list" as the entry name to print every entry name instead.
"""
import sys, os
sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
from mw4db import read_records, norm


def main():
    if len(sys.argv) < 3:
        sys.exit(__doc__)
    path, want = sys.argv[1], norm(sys.argv[2])
    _content, recs = read_records(path)
    if want == "--list":
        for rid, name, dlen, rlen, _blob in recs:
            print(f"{rid}\t{name}\t{dlen}\t{rlen}")
        return
    for _rid, name, _dlen, _rlen, blob in recs:
        if norm(name) == want:
            if len(sys.argv) > 3:
                open(sys.argv[3], "wb").write(blob)
            else:
                sys.stdout.buffer.write(blob)
            return
    sys.exit(f"not found: {want}")


if __name__ == "__main__":
    main()